PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/28-21:13:00
G02     31.3           57.2                9.6 +/-    1.13      11.2 +/-    1.13  0.060 / 0.040
G05     143.5          62.4               11.3 +/-    0.77      12.6 +/-    0.77  0.030 / 0.040
G06     55.2           14.0                8.2 +/-    2.09      20.8 +/-    2.09  0.030 / 0.040
G12     194.9          64.6               11.2 +/-    0.97      12.3 +/-    0.97  0.030 / 0.030
G20     197.9          29.6               13.6 +/-    2.29      24.0 +/-    2.29  0.050 / 0.040
G25     287.6          58.5                9.6 +/-    3.75      11.0 +/-    3.75  0.030 / 0.040
G29     309.5          30.8                9.1 +/-    1.42      15.7 +/-    1.42  0.030 / 0.030